bn_part_sub_word prototype.

[openssl.git] / ssl / ssl_lib.c

/*! \file ssl/ssl_lib.c
 *  \brief Version independent SSL functions.
 */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * The implementation was written so as to conform with Netscapes SSL.
 * 
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
 * 
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young (eay@cryptsoft.com)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from 
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
 * 
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * 
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */


#include <assert.h>
#include <stdio.h>
#include <openssl/objects.h>
#include <openssl/lhash.h>
#include <openssl/x509v3.h>
#include "ssl_locl.h"

const char *SSL_version_str=OPENSSL_VERSION_TEXT;

static STACK_OF(CRYPTO_EX_DATA_FUNCS) *ssl_meth=NULL;
static STACK_OF(CRYPTO_EX_DATA_FUNCS) *ssl_ctx_meth=NULL;
static int ssl_meth_num=0;
static int ssl_ctx_meth_num=0;

OPENSSL_GLOBAL SSL3_ENC_METHOD ssl3_undef_enc_method={
        /* evil casts, but these functions are only called if there's a library bug */
        (int (*)(SSL *,int))ssl_undefined_function,
        (int (*)(SSL *, unsigned char *, int))ssl_undefined_function,
        ssl_undefined_function,
        (int (*)(SSL *, unsigned char *, unsigned char *, int))ssl_undefined_function,
        (int (*)(SSL*, int))ssl_undefined_function,
        (int (*)(SSL *, EVP_MD_CTX *, EVP_MD_CTX *, const char*, int, unsigned char *))ssl_undefined_function
        };

int SSL_clear(SSL *s)
        {
        int state;

        if (s->method == NULL)
                {
                SSLerr(SSL_F_SSL_CLEAR,SSL_R_NO_METHOD_SPECIFIED);
                return(0);
                }

        s->error=0;
        s->hit=0;
        s->shutdown=0;

#if 0 /* Disabled since version 1.10 of this file (early return not
       * needed because SSL_clear is not called when doing renegotiation) */
        /* This is set if we are doing dynamic renegotiation so keep
         * the old cipher.  It is sort of a SSL_clear_lite :-) */
        if (s->new_session) return(1);
#else
        if (s->new_session)
                {
                SSLerr(SSL_F_SSL_CLEAR,SSL_R_INTERNAL_ERROR);
                return 0;
                }
#endif

        state=s->state; /* Keep to check if we throw away the session-id */
        s->type=0;

        s->state=SSL_ST_BEFORE|((s->server)?SSL_ST_ACCEPT:SSL_ST_CONNECT);

        s->version=s->method->version;
        s->client_version=s->version;
        s->rwstate=SSL_NOTHING;
        s->rstate=SSL_ST_READ_HEADER;
#if 0
        s->read_ahead=s->ctx->read_ahead;
#endif

        if (s->init_buf != NULL)
                {
                BUF_MEM_free(s->init_buf);
                s->init_buf=NULL;
                }

        ssl_clear_cipher_ctx(s);

        if (ssl_clear_bad_session(s))
                {
                SSL_SESSION_free(s->session);
                s->session=NULL;
                }

        s->first_packet=0;

#if 1
        /* Check to see if we were changed into a different method, if
         * so, revert back if we are not doing session-id reuse. */
        if ((s->session == NULL) && (s->method != s->ctx->method))
                {
                s->method->ssl_free(s);
                s->method=s->ctx->method;
                if (!s->method->ssl_new(s))
                        return(0);
                }
        else
#endif
                s->method->ssl_clear(s);
        return(1);
        }

/** Used to change an SSL_CTXs default SSL method type */
int SSL_CTX_set_ssl_version(SSL_CTX *ctx,SSL_METHOD *meth)
        {
        STACK_OF(SSL_CIPHER) *sk;

        ctx->method=meth;

        sk=ssl_create_cipher_list(ctx->method,&(ctx->cipher_list),
                &(ctx->cipher_list_by_id),SSL_DEFAULT_CIPHER_LIST);
        if ((sk == NULL) || (sk_SSL_CIPHER_num(sk) <= 0))
                {
                SSLerr(SSL_F_SSL_CTX_SET_SSL_VERSION,SSL_R_SSL_LIBRARY_HAS_NO_CIPHERS);
                return(0);
                }
        return(1);
        }

SSL *SSL_new(SSL_CTX *ctx)
        {
        SSL *s;

        if (ctx == NULL)
                {
                SSLerr(SSL_F_SSL_NEW,SSL_R_NULL_SSL_CTX);
                return(NULL);
                }
        if (ctx->method == NULL)
                {
                SSLerr(SSL_F_SSL_NEW,SSL_R_SSL_CTX_HAS_NO_DEFAULT_SSL_VERSION);
                return(NULL);
                }

        s=(SSL *)OPENSSL_malloc(sizeof(SSL));
        if (s == NULL) goto err;
        memset(s,0,sizeof(SSL));

#ifndef NO_KRB5
        s->kssl_ctx = kssl_ctx_new();
#endif  /* NO_KRB5 */

        if (ctx->cert != NULL)
                {
                /* Earlier library versions used to copy the pointer to
                 * the CERT, not its contents; only when setting new
                 * parameters for the per-SSL copy, ssl_cert_new would be
                 * called (and the direct reference to the per-SSL_CTX
                 * settings would be lost, but those still were indirectly
                 * accessed for various purposes, and for that reason they
                 * used to be known as s->ctx->default_cert).
                 * Now we don't look at the SSL_CTX's CERT after having
                 * duplicated it once. */

                s->cert = ssl_cert_dup(ctx->cert);
                if (s->cert == NULL)
                        goto err;
                }
        else
                s->cert=NULL; /* Cannot really happen (see SSL_CTX_new) */
        s->sid_ctx_length=ctx->sid_ctx_length;
        memcpy(&s->sid_ctx,&ctx->sid_ctx,sizeof(s->sid_ctx));
        s->verify_mode=ctx->verify_mode;
        s->verify_depth=ctx->verify_depth;
        s->verify_callback=ctx->default_verify_callback;
        s->purpose = ctx->purpose;
        s->trust = ctx->trust;
        CRYPTO_add(&ctx->references,1,CRYPTO_LOCK_SSL_CTX);
        s->ctx=ctx;

        s->verify_result=X509_V_OK;

        s->method=ctx->method;

        if (!s->method->ssl_new(s))
                goto err;

        s->quiet_shutdown=ctx->quiet_shutdown;
        s->references=1;
        s->server=(ctx->method->ssl_accept == ssl_undefined_function)?0:1;
        s->options=ctx->options;
        s->mode=ctx->mode;
        s->read_ahead=ctx->read_ahead; /* used to happen in SSL_clear */
        SSL_clear(s);

        CRYPTO_new_ex_data(ssl_meth,s,&s->ex_data);

        return(s);
err:
        if (s != NULL)
                {
                if (s->cert != NULL)
                        ssl_cert_free(s->cert);
                if (s->ctx != NULL)
                        SSL_CTX_free(s->ctx); /* decrement reference count */
                OPENSSL_free(s);
                }
        SSLerr(SSL_F_SSL_NEW,ERR_R_MALLOC_FAILURE);
        return(NULL);
        }

int SSL_CTX_set_session_id_context(SSL_CTX *ctx,const unsigned char *sid_ctx,
                                   unsigned int sid_ctx_len)
    {
    if(sid_ctx_len > SSL_MAX_SID_CTX_LENGTH)
        {
        SSLerr(SSL_F_SSL_CTX_SET_SESSION_ID_CONTEXT,SSL_R_SSL_SESSION_ID_CONTEXT_TOO_LONG);
        return 0;
        }
    ctx->sid_ctx_length=sid_ctx_len;
    memcpy(ctx->sid_ctx,sid_ctx,sid_ctx_len);

    return 1;
    }

int SSL_set_session_id_context(SSL *ssl,const unsigned char *sid_ctx,
                               unsigned int sid_ctx_len)
    {
    if(sid_ctx_len > SSL_MAX_SID_CTX_LENGTH)
        {
        SSLerr(SSL_F_SSL_SET_SESSION_ID_CONTEXT,SSL_R_SSL_SESSION_ID_CONTEXT_TOO_LONG);
        return 0;
        }
    ssl->sid_ctx_length=sid_ctx_len;
    memcpy(ssl->sid_ctx,sid_ctx,sid_ctx_len);

    return 1;
    }

int SSL_CTX_set_purpose(SSL_CTX *s, int purpose)
{
        if(X509_PURPOSE_get_by_id(purpose) == -1) {
                SSLerr(SSL_F_SSL_CTX_SET_PURPOSE, SSL_R_INVALID_PURPOSE);
                return 0;
        }
        s->purpose = purpose;
        return 1;
}

int SSL_set_purpose(SSL *s, int purpose)
{
        if(X509_PURPOSE_get_by_id(purpose) == -1) {
                SSLerr(SSL_F_SSL_SET_PURPOSE, SSL_R_INVALID_PURPOSE);
                return 0;
        }
        s->purpose = purpose;
        return 1;
}
        
int SSL_CTX_set_trust(SSL_CTX *s, int trust)
{
        if(X509_TRUST_get_by_id(trust) == -1) {
                SSLerr(SSL_F_SSL_CTX_SET_TRUST, SSL_R_INVALID_TRUST);
                return 0;
        }
        s->trust = trust;
        return 1;
}

int SSL_set_trust(SSL *s, int trust)
{
        if(X509_TRUST_get_by_id(trust) == -1) {
                SSLerr(SSL_F_SSL_SET_TRUST, SSL_R_INVALID_TRUST);
                return 0;
        }
        s->trust = trust;
        return 1;
}

void SSL_free(SSL *s)
        {
        int i;

        if(s == NULL)
            return;

        i=CRYPTO_add(&s->references,-1,CRYPTO_LOCK_SSL);
#ifdef REF_PRINT
        REF_PRINT("SSL",s);
#endif
        if (i > 0) return;
#ifdef REF_CHECK
        if (i < 0)
                {
                fprintf(stderr,"SSL_free, bad reference count\n");
                abort(); /* ok */
                }
#endif

        CRYPTO_free_ex_data(ssl_meth,(char *)s,&s->ex_data);

        if (s->bbio != NULL)
                {
                /* If the buffering BIO is in place, pop it off */
                if (s->bbio == s->wbio)
                        {
                        s->wbio=BIO_pop(s->wbio);
                        }
                BIO_free(s->bbio);
                s->bbio=NULL;
                }
        if (s->rbio != NULL)
                BIO_free_all(s->rbio);
        if ((s->wbio != NULL) && (s->wbio != s->rbio))
                BIO_free_all(s->wbio);

        if (s->init_buf != NULL) BUF_MEM_free(s->init_buf);

        /* add extra stuff */
        if (s->cipher_list != NULL) sk_SSL_CIPHER_free(s->cipher_list);
        if (s->cipher_list_by_id != NULL) sk_SSL_CIPHER_free(s->cipher_list_by_id);

        /* Make the next call work :-) */
        if (s->session != NULL)
                {
                ssl_clear_bad_session(s);
                SSL_SESSION_free(s->session);
                }

        ssl_clear_cipher_ctx(s);

        if (s->cert != NULL) ssl_cert_free(s->cert);
        /* Free up if allocated */

        if (s->ctx) SSL_CTX_free(s->ctx);

        if (s->client_CA != NULL)
                sk_X509_NAME_pop_free(s->client_CA,X509_NAME_free);

        if (s->method != NULL) s->method->ssl_free(s);

        OPENSSL_free(s);
        }

void SSL_set_bio(SSL *s,BIO *rbio,BIO *wbio)
        {
        /* If the output buffering BIO is still in place, remove it
         */
        if (s->bbio != NULL)
                {
                if (s->wbio == s->bbio)
                        {
                        s->wbio=s->wbio->next_bio;
                        s->bbio->next_bio=NULL;
                        }
                }
        if ((s->rbio != NULL) && (s->rbio != rbio))
                BIO_free_all(s->rbio);
        if ((s->wbio != NULL) && (s->wbio != wbio) && (s->rbio != s->wbio))
                BIO_free_all(s->wbio);
        s->rbio=rbio;
        s->wbio=wbio;
        }

BIO *SSL_get_rbio(SSL *s)
        { return(s->rbio); }

BIO *SSL_get_wbio(SSL *s)
        { return(s->wbio); }

int SSL_get_fd(SSL *s)
        {
        int ret= -1;
        BIO *b,*r;

        b=SSL_get_rbio(s);
        r=BIO_find_type(b,BIO_TYPE_DESCRIPTOR);
        if (r != NULL)
                BIO_get_fd(r,&ret);
        return(ret);
        }

#ifndef NO_SOCK
int SSL_set_fd(SSL *s,int fd)
        {
        int ret=0;
        BIO *bio=NULL;

        bio=BIO_new(BIO_s_socket());

        if (bio == NULL)
                {
                SSLerr(SSL_F_SSL_SET_FD,ERR_R_BUF_LIB);
                goto err;
                }
        BIO_set_fd(bio,fd,BIO_NOCLOSE);
        SSL_set_bio(s,bio,bio);
        ret=1;
err:
        return(ret);
        }

int SSL_set_wfd(SSL *s,int fd)
        {
        int ret=0;
        BIO *bio=NULL;

        if ((s->rbio == NULL) || (BIO_method_type(s->rbio) != BIO_TYPE_SOCKET)
                || ((int)BIO_get_fd(s->rbio,NULL) != fd))
                {
                bio=BIO_new(BIO_s_socket());

                if (bio == NULL)
                        { SSLerr(SSL_F_SSL_SET_WFD,ERR_R_BUF_LIB); goto err; }
                BIO_set_fd(bio,fd,BIO_NOCLOSE);
                SSL_set_bio(s,SSL_get_rbio(s),bio);
                }
        else
                SSL_set_bio(s,SSL_get_rbio(s),SSL_get_rbio(s));
        ret=1;
err:
        return(ret);
        }

int SSL_set_rfd(SSL *s,int fd)
        {
        int ret=0;
        BIO *bio=NULL;

        if ((s->wbio == NULL) || (BIO_method_type(s->wbio) != BIO_TYPE_SOCKET)
                || ((int)BIO_get_fd(s->wbio,NULL) != fd))
                {
                bio=BIO_new(BIO_s_socket());

                if (bio == NULL)
                        {
                        SSLerr(SSL_F_SSL_SET_RFD,ERR_R_BUF_LIB);
                        goto err;
                        }
                BIO_set_fd(bio,fd,BIO_NOCLOSE);
                SSL_set_bio(s,bio,SSL_get_wbio(s));
                }
        else
                SSL_set_bio(s,SSL_get_wbio(s),SSL_get_wbio(s));
        ret=1;
err:
        return(ret);
        }
#endif


/* return length of latest Finished message we sent, copy to 'buf' */
size_t SSL_get_finished(SSL *s, void *buf, size_t count)
        {
        size_t ret = 0;
        
        if (s->s3 != NULL)
                {
                ret = s->s3->tmp.finish_md_len;
                if (count > ret)
                        count = ret;
                memcpy(buf, s->s3->tmp.finish_md, count);
                }
        return ret;
        }

/* return length of latest Finished message we expected, copy to 'buf' */
size_t SSL_get_peer_finished(SSL *s, void *buf, size_t count)
        {
        size_t ret = 0;
        
        if (s->s3 != NULL)
                {
                ret = s->s3->tmp.peer_finish_md_len;
                if (count > ret)
                        count = ret;
                memcpy(buf, s->s3->tmp.peer_finish_md, count);
                }
        return ret;
        }


int SSL_get_verify_mode(SSL *s)
        {
        return(s->verify_mode);
        }

int SSL_get_verify_depth(SSL *s)
        {
        return(s->verify_depth);
        }

int (*SSL_get_verify_callback(SSL *s))(int,X509_STORE_CTX *)
        {
        return(s->verify_callback);
        }

int SSL_CTX_get_verify_mode(SSL_CTX *ctx)
        {
        return(ctx->verify_mode);
        }

int SSL_CTX_get_verify_depth(SSL_CTX *ctx)
        {
        return(ctx->verify_depth);
        }

int (*SSL_CTX_get_verify_callback(SSL_CTX *ctx))(int,X509_STORE_CTX *)
        {
        return(ctx->default_verify_callback);
        }

void SSL_set_verify(SSL *s,int mode,
                    int (*callback)(int ok,X509_STORE_CTX *ctx))
        {
        s->verify_mode=mode;
        if (callback != NULL)
                s->verify_callback=callback;
        }

void SSL_set_verify_depth(SSL *s,int depth)
        {
        s->verify_depth=depth;
        }

void SSL_set_read_ahead(SSL *s,int yes)
        {
        s->read_ahead=yes;
        }

int SSL_get_read_ahead(SSL *s)
        {
        return(s->read_ahead);
        }

int SSL_pending(SSL *s)
        {
        /* SSL_pending cannot work properly if read-ahead is enabled
         * (SSL_[CTX_]ctrl(..., SSL_CTRL_SET_READ_AHEAD, 1, NULL)),
         * and it is impossible to fix since SSL_pending cannot report
         * errors that may be observed while scanning the new data.
         * (Note that SSL_pending() is often used as a boolean value,
         * so we'd better not return -1.)
         */
        return(s->method->ssl_pending(s));
        }

X509 *SSL_get_peer_certificate(SSL *s)
        {
        X509 *r;
        
        if ((s == NULL) || (s->session == NULL))
                r=NULL;
        else
                r=s->session->peer;

        if (r == NULL) return(r);

        CRYPTO_add(&r->references,1,CRYPTO_LOCK_X509);

        return(r);
        }

STACK_OF(X509) *SSL_get_peer_cert_chain(SSL *s)
        {
        STACK_OF(X509) *r;
        
        if ((s == NULL) || (s->session == NULL) || (s->session->sess_cert == NULL))
                r=NULL;
        else
                r=s->session->sess_cert->cert_chain;

        /* If we are a client, cert_chain includes the peer's own
         * certificate; if we are a server, it does not. */
        
        return(r);
        }

/* Now in theory, since the calling process own 't' it should be safe to
 * modify.  We need to be able to read f without being hassled */
void SSL_copy_session_id(SSL *t,SSL *f)
        {
        CERT *tmp;

        /* Do we need to to SSL locking? */
        SSL_set_session(t,SSL_get_session(f));

        /* what if we are setup as SSLv2 but want to talk SSLv3 or
         * vice-versa */
        if (t->method != f->method)
                {
                t->method->ssl_free(t); /* cleanup current */
                t->method=f->method;    /* change method */
                t->method->ssl_new(t);  /* setup new */
                }

        tmp=t->cert;
        if (f->cert != NULL)
                {
                CRYPTO_add(&f->cert->references,1,CRYPTO_LOCK_SSL_CERT);
                t->cert=f->cert;
                }
        else
                t->cert=NULL;
        if (tmp != NULL) ssl_cert_free(tmp);
        SSL_set_session_id_context(t,f->sid_ctx,f->sid_ctx_length);
        }

/* Fix this so it checks all the valid key/cert options */
int SSL_CTX_check_private_key(SSL_CTX *ctx)
        {
        if (    (ctx == NULL) ||
                (ctx->cert == NULL) ||
                (ctx->cert->key->x509 == NULL))
                {
                SSLerr(SSL_F_SSL_CTX_CHECK_PRIVATE_KEY,SSL_R_NO_CERTIFICATE_ASSIGNED);
                return(0);
                }
        if      (ctx->cert->key->privatekey == NULL)
                {
                SSLerr(SSL_F_SSL_CTX_CHECK_PRIVATE_KEY,SSL_R_NO_PRIVATE_KEY_ASSIGNED);
                return(0);
                }
        return(X509_check_private_key(ctx->cert->key->x509, ctx->cert->key->privatekey));
        }

/* Fix this function so that it takes an optional type parameter */
int SSL_check_private_key(SSL *ssl)
        {
        if (ssl == NULL)
                {
                SSLerr(SSL_F_SSL_CHECK_PRIVATE_KEY,ERR_R_PASSED_NULL_PARAMETER);
                return(0);
                }
        if (ssl->cert == NULL)
                {
                SSLerr(SSL_F_SSL_CHECK_PRIVATE_KEY,SSL_R_NO_CERTIFICATE_ASSIGNED);
                return 0;
                }
        if (ssl->cert->key->x509 == NULL)
                {
                SSLerr(SSL_F_SSL_CHECK_PRIVATE_KEY,SSL_R_NO_CERTIFICATE_ASSIGNED);
                return(0);
                }
        if (ssl->cert->key->privatekey == NULL)
                {
                SSLerr(SSL_F_SSL_CHECK_PRIVATE_KEY,SSL_R_NO_PRIVATE_KEY_ASSIGNED);
                return(0);
                }
        return(X509_check_private_key(ssl->cert->key->x509,
                ssl->cert->key->privatekey));
        }

int SSL_accept(SSL *s)
        {
        if (s->handshake_func == 0)
                /* Not properly initialized yet */
                SSL_set_accept_state(s);

        return(s->method->ssl_accept(s));
        }

int SSL_connect(SSL *s)
        {
        if (s->handshake_func == 0)
                /* Not properly initialized yet */
                SSL_set_connect_state(s);

        return(s->method->ssl_connect(s));
        }

long SSL_get_default_timeout(SSL *s)
        {
        return(s->method->get_timeout());
        }

int SSL_read(SSL *s,char *buf,int num)
        {
        if (s->handshake_func == 0)
                {
                SSLerr(SSL_F_SSL_READ, SSL_R_UNINITIALIZED);
                return -1;
                }

        if (s->shutdown & SSL_RECEIVED_SHUTDOWN)
                {
                s->rwstate=SSL_NOTHING;
                return(0);
                }
        return(s->method->ssl_read(s,buf,num));
        }

int SSL_peek(SSL *s,char *buf,int num)
        {
        if (s->shutdown & SSL_RECEIVED_SHUTDOWN)
                {
                return(0);
                }
        return(s->method->ssl_peek(s,buf,num));
        }

int SSL_write(SSL *s,const char *buf,int num)
        {
        if (s->handshake_func == 0)
                {
                SSLerr(SSL_F_SSL_WRITE, SSL_R_UNINITIALIZED);
                return -1;
                }

        if (s->shutdown & SSL_SENT_SHUTDOWN)
                {
                s->rwstate=SSL_NOTHING;
                SSLerr(SSL_F_SSL_WRITE,SSL_R_PROTOCOL_IS_SHUTDOWN);
                return(-1);
                }
        return(s->method->ssl_write(s,buf,num));
        }

int SSL_shutdown(SSL *s)
        {
        /* Note that this function behaves differently from what one might
         * expect.  Return values are 0 for no success (yet),
         * 1 for success; but calling it once is usually not enough,
         * even if blocking I/O is used (see ssl3_shutdown).
         */

        if (s->handshake_func == 0)
                {
                SSLerr(SSL_F_SSL_SHUTDOWN, SSL_R_UNINITIALIZED);
                return -1;
                }

        if ((s != NULL) && !SSL_in_init(s))
                return(s->method->ssl_shutdown(s));
        else
                return(1);
        }

int SSL_renegotiate(SSL *s)
        {
        s->new_session=1;
        return(s->method->ssl_renegotiate(s));
        }

long SSL_ctrl(SSL *s,int cmd,long larg,char *parg)
        {
        long l;

        switch (cmd)
                {
        case SSL_CTRL_GET_READ_AHEAD:
                return(s->read_ahead);
        case SSL_CTRL_SET_READ_AHEAD:
                l=s->read_ahead;
                s->read_ahead=larg;
                return(l);
        case SSL_CTRL_OPTIONS:
                return(s->options|=larg);
        case SSL_CTRL_MODE:
                return(s->mode|=larg);
        default:
                return(s->method->ssl_ctrl(s,cmd,larg,parg));
                }
        }

long SSL_callback_ctrl(SSL *s, int cmd, void (*fp)())
        {
        switch(cmd)
                {
        default:
                return(s->method->ssl_callback_ctrl(s,cmd,fp));
                }
        }

struct lhash_st *SSL_CTX_sessions(SSL_CTX *ctx)
        {
        return ctx->sessions;
        }

long SSL_CTX_ctrl(SSL_CTX *ctx,int cmd,long larg,char *parg)
        {
        long l;

        switch (cmd)
                {
        case SSL_CTRL_GET_READ_AHEAD:
                return(ctx->read_ahead);
        case SSL_CTRL_SET_READ_AHEAD:
                l=ctx->read_ahead;
                ctx->read_ahead=larg;
                return(l);

        case SSL_CTRL_SET_SESS_CACHE_SIZE:
                l=ctx->session_cache_size;
                ctx->session_cache_size=larg;
                return(l);
        case SSL_CTRL_GET_SESS_CACHE_SIZE:
                return(ctx->session_cache_size);
        case SSL_CTRL_SET_SESS_CACHE_MODE:
                l=ctx->session_cache_mode;
                ctx->session_cache_mode=larg;
                return(l);
        case SSL_CTRL_GET_SESS_CACHE_MODE:
                return(ctx->session_cache_mode);

        case SSL_CTRL_SESS_NUMBER:
                return(ctx->sessions->num_items);
        case SSL_CTRL_SESS_CONNECT:
                return(ctx->stats.sess_connect);
        case SSL_CTRL_SESS_CONNECT_GOOD:
                return(ctx->stats.sess_connect_good);
        case SSL_CTRL_SESS_CONNECT_RENEGOTIATE:
                return(ctx->stats.sess_connect_renegotiate);
        case SSL_CTRL_SESS_ACCEPT:
                return(ctx->stats.sess_accept);
        case SSL_CTRL_SESS_ACCEPT_GOOD:
                return(ctx->stats.sess_accept_good);
        case SSL_CTRL_SESS_ACCEPT_RENEGOTIATE:
                return(ctx->stats.sess_accept_renegotiate);
        case SSL_CTRL_SESS_HIT:
                return(ctx->stats.sess_hit);
        case SSL_CTRL_SESS_CB_HIT:
                return(ctx->stats.sess_cb_hit);
        case SSL_CTRL_SESS_MISSES:
                return(ctx->stats.sess_miss);
        case SSL_CTRL_SESS_TIMEOUTS:
                return(ctx->stats.sess_timeout);
        case SSL_CTRL_SESS_CACHE_FULL:
                return(ctx->stats.sess_cache_full);
        case SSL_CTRL_OPTIONS:
                return(ctx->options|=larg);
        case SSL_CTRL_MODE:
                return(ctx->mode|=larg);
        default:
                return(ctx->method->ssl_ctx_ctrl(ctx,cmd,larg,parg));
                }
        }

long SSL_CTX_callback_ctrl(SSL_CTX *ctx, int cmd, void (*fp)())
        {
        switch(cmd)
                {
        default:
                return(ctx->method->ssl_ctx_callback_ctrl(ctx,cmd,fp));
                }
        }

int ssl_cipher_id_cmp(const SSL_CIPHER *a, const SSL_CIPHER *b)
        {
        long l;

        l=a->id-b->id;
        if (l == 0L)
                return(0);
        else
                return((l > 0)?1:-1);
        }

int ssl_cipher_ptr_id_cmp(const SSL_CIPHER * const *ap,
                        const SSL_CIPHER * const *bp)
        {
        long l;

        l=(*ap)->id-(*bp)->id;
        if (l == 0L)
                return(0);
        else
                return((l > 0)?1:-1);
        }

/** return a STACK of the ciphers available for the SSL and in order of
 * preference */
STACK_OF(SSL_CIPHER) *SSL_get_ciphers(SSL *s)
        {
        if ((s != NULL) && (s->cipher_list != NULL))
                {
                return(s->cipher_list);
                }
        else if ((s->ctx != NULL) &&
                (s->ctx->cipher_list != NULL))
                {
                return(s->ctx->cipher_list);
                }
        return(NULL);
        }

/** return a STACK of the ciphers available for the SSL and in order of
 * algorithm id */
STACK_OF(SSL_CIPHER) *ssl_get_ciphers_by_id(SSL *s)
        {
        if ((s != NULL) && (s->cipher_list_by_id != NULL))
                {
                return(s->cipher_list_by_id);
                }
        else if ((s != NULL) && (s->ctx != NULL) &&
                (s->ctx->cipher_list_by_id != NULL))
                {
                return(s->ctx->cipher_list_by_id);
                }
        return(NULL);
        }

/** The old interface to get the same thing as SSL_get_ciphers() */
const char *SSL_get_cipher_list(SSL *s,int n)
        {
        SSL_CIPHER *c;
        STACK_OF(SSL_CIPHER) *sk;

        if (s == NULL) return(NULL);
        sk=SSL_get_ciphers(s);
        if ((sk == NULL) || (sk_SSL_CIPHER_num(sk) <= n))
                return(NULL);
        c=sk_SSL_CIPHER_value(sk,n);
        if (c == NULL) return(NULL);
        return(c->name);
        }

/** specify the ciphers to be used by default by the SSL_CTX */
int SSL_CTX_set_cipher_list(SSL_CTX *ctx, const char *str)
        {
        STACK_OF(SSL_CIPHER) *sk;
        
        sk=ssl_create_cipher_list(ctx->method,&ctx->cipher_list,
                &ctx->cipher_list_by_id,str);
/* XXXX */
        return((sk == NULL)?0:1);
        }

/** specify the ciphers to be used by the SSL */
int SSL_set_cipher_list(SSL *s,const char *str)
        {
        STACK_OF(SSL_CIPHER) *sk;
        
        sk=ssl_create_cipher_list(s->ctx->method,&s->cipher_list,
                &s->cipher_list_by_id,str);
/* XXXX */
        return((sk == NULL)?0:1);
        }

/* works well for SSLv2, not so good for SSLv3 */
char *SSL_get_shared_ciphers(SSL *s,char *buf,int len)
        {
        char *p;
        const char *cp;
        STACK_OF(SSL_CIPHER) *sk;
        SSL_CIPHER *c;
        int i;

        if ((s->session == NULL) || (s->session->ciphers == NULL) ||
                (len < 2))
                return(NULL);

        p=buf;
        sk=s->session->ciphers;
        for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
                {
                /* Decrement for either the ':' or a '\0' */
                len--;
                c=sk_SSL_CIPHER_value(sk,i);
                for (cp=c->name; *cp; )
                        {
                        if (len-- == 0)
                                {
                                *p='\0';
                                return(buf);
                                }
                        else
                                *(p++)= *(cp++);
                        }
                *(p++)=':';
                }
        p[-1]='\0';
        return(buf);
        }

int ssl_cipher_list_to_bytes(SSL *s,STACK_OF(SSL_CIPHER) *sk,unsigned char *p)
        {
        int i,j=0;
        SSL_CIPHER *c;
        unsigned char *q;

        if (sk == NULL) return(0);
        q=p;

        for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
                {
                c=sk_SSL_CIPHER_value(sk,i);
                j=ssl_put_cipher_by_char(s,c,p);
                p+=j;
                }
        return(p-q);
        }

STACK_OF(SSL_CIPHER) *ssl_bytes_to_cipher_list(SSL *s,unsigned char *p,int num,
                                               STACK_OF(SSL_CIPHER) **skp)
        {
        SSL_CIPHER *c;
        STACK_OF(SSL_CIPHER) *sk;
        int i,n;

        n=ssl_put_cipher_by_char(s,NULL,NULL);
        if ((num%n) != 0)
                {
                SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST,SSL_R_ERROR_IN_RECEIVED_CIPHER_LIST);
                return(NULL);
                }
        if ((skp == NULL) || (*skp == NULL))
                sk=sk_SSL_CIPHER_new_null(); /* change perhaps later */
        else
                {
                sk= *skp;
                sk_SSL_CIPHER_zero(sk);
                }

        for (i=0; i<num; i+=n)
                {
                c=ssl_get_cipher_by_char(s,p);
                p+=n;
                if (c != NULL)
                        {
                        if (!sk_SSL_CIPHER_push(sk,c))
                                {
                                SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST,ERR_R_MALLOC_FAILURE);
                                goto err;
                                }
                        }
                }

        if (skp != NULL)
                *skp=sk;
        return(sk);
err:
        if ((skp == NULL) || (*skp == NULL))
                sk_SSL_CIPHER_free(sk);
        return(NULL);
        }

unsigned long SSL_SESSION_hash(SSL_SESSION *a)
        {
        unsigned long l;

        l=(unsigned long)
                ((unsigned int) a->session_id[0]     )|
                ((unsigned int) a->session_id[1]<< 8L)|
                ((unsigned long)a->session_id[2]<<16L)|
                ((unsigned long)a->session_id[3]<<24L);
        return(l);
        }

int SSL_SESSION_cmp(SSL_SESSION *a,SSL_SESSION *b)
        {
        if (a->ssl_version != b->ssl_version)
                return(1);
        if (a->session_id_length != b->session_id_length)
                return(1);
        return(memcmp(a->session_id,b->session_id,a->session_id_length));
        }

static IMPLEMENT_LHASH_HASH_FN(SSL_SESSION_hash, SSL_SESSION *)
static IMPLEMENT_LHASH_COMP_FN(SSL_SESSION_cmp, SSL_SESSION *)

SSL_CTX *SSL_CTX_new(SSL_METHOD *meth)
        {
        SSL_CTX *ret=NULL;
        
        if (meth == NULL)
                {
                SSLerr(SSL_F_SSL_CTX_NEW,SSL_R_NULL_SSL_METHOD_PASSED);
                return(NULL);
                }

        if (SSL_get_ex_data_X509_STORE_CTX_idx() < 0)
                {
                SSLerr(SSL_F_SSL_CTX_NEW,SSL_R_X509_VERIFICATION_SETUP_PROBLEMS);
                goto err;
                }
        ret=(SSL_CTX *)OPENSSL_malloc(sizeof(SSL_CTX));
        if (ret == NULL)
                goto err;

        memset(ret,0,sizeof(SSL_CTX));

        ret->method=meth;

        ret->cert_store=NULL;
        ret->session_cache_mode=SSL_SESS_CACHE_SERVER;
        ret->session_cache_size=SSL_SESSION_CACHE_MAX_SIZE_DEFAULT;
        ret->session_cache_head=NULL;
        ret->session_cache_tail=NULL;

        /* We take the system default */
        ret->session_timeout=meth->get_timeout();

        ret->new_session_cb=NULL;
        ret->remove_session_cb=NULL;
        ret->get_session_cb=NULL;

        memset((char *)&ret->stats,0,sizeof(ret->stats));

        ret->references=1;
        ret->quiet_shutdown=0;

/*      ret->cipher=NULL;*/
/*      ret->s2->challenge=NULL;
        ret->master_key=NULL;
        ret->key_arg=NULL;
        ret->s2->conn_id=NULL; */

        ret->info_callback=NULL;

        ret->app_verify_callback=NULL;
        ret->app_verify_arg=NULL;

        ret->read_ahead=0;
        ret->verify_mode=SSL_VERIFY_NONE;
        ret->verify_depth=-1; /* Don't impose a limit (but x509_lu.c does) */
        ret->default_verify_callback=NULL;
        if ((ret->cert=ssl_cert_new()) == NULL)
                goto err;

        ret->default_passwd_callback=NULL;
        ret->default_passwd_callback_userdata=NULL;
        ret->client_cert_cb=NULL;

        ret->sessions=lh_new(LHASH_HASH_FN(SSL_SESSION_hash),
                        LHASH_COMP_FN(SSL_SESSION_cmp));
        if (ret->sessions == NULL) goto err;
        ret->cert_store=X509_STORE_new();
        if (ret->cert_store == NULL) goto err;

        ssl_create_cipher_list(ret->method,
                &ret->cipher_list,&ret->cipher_list_by_id,
                SSL_DEFAULT_CIPHER_LIST);
        if (ret->cipher_list == NULL
            || sk_SSL_CIPHER_num(ret->cipher_list) <= 0)
                {
                SSLerr(SSL_F_SSL_CTX_NEW,SSL_R_LIBRARY_HAS_NO_CIPHERS);
                goto err2;
                }

        if ((ret->rsa_md5=EVP_get_digestbyname("ssl2-md5")) == NULL)
                {
                SSLerr(SSL_F_SSL_CTX_NEW,SSL_R_UNABLE_TO_LOAD_SSL2_MD5_ROUTINES);
                goto err2;
                }
        if ((ret->md5=EVP_get_digestbyname("ssl3-md5")) == NULL)
                {
                SSLerr(SSL_F_SSL_CTX_NEW,SSL_R_UNABLE_TO_LOAD_SSL3_MD5_ROUTINES);
                goto err2;
                }
        if ((ret->sha1=EVP_get_digestbyname("ssl3-sha1")) == NULL)
                {
                SSLerr(SSL_F_SSL_CTX_NEW,SSL_R_UNABLE_TO_LOAD_SSL3_SHA1_ROUTINES);
                goto err2;
                }

        if ((ret->client_CA=sk_X509_NAME_new_null()) == NULL)
                goto err;

        CRYPTO_new_ex_data(ssl_ctx_meth,(char *)ret,&ret->ex_data);

        ret->extra_certs=NULL;
        ret->comp_methods=SSL_COMP_get_compression_methods();

        return(ret);
err:
        SSLerr(SSL_F_SSL_CTX_NEW,ERR_R_MALLOC_FAILURE);
err2:
        if (ret != NULL) SSL_CTX_free(ret);
        return(NULL);
        }

#if 0
static void SSL_COMP_free(SSL_COMP *comp)
    { OPENSSL_free(comp); }
#endif

void SSL_CTX_free(SSL_CTX *a)
        {
        int i;

        if (a == NULL) return;

        i=CRYPTO_add(&a->references,-1,CRYPTO_LOCK_SSL_CTX);
#ifdef REF_PRINT
        REF_PRINT("SSL_CTX",a);
#endif
        if (i > 0) return;
#ifdef REF_CHECK
        if (i < 0)
                {
                fprintf(stderr,"SSL_CTX_free, bad reference count\n");
                abort(); /* ok */
                }
#endif
        CRYPTO_free_ex_data(ssl_ctx_meth,(char *)a,&a->ex_data);

        if (a->sessions != NULL)
                {
                SSL_CTX_flush_sessions(a,0);
                lh_free(a->sessions);
                }
        if (a->cert_store != NULL)
                X509_STORE_free(a->cert_store);
        if (a->cipher_list != NULL)
                sk_SSL_CIPHER_free(a->cipher_list);
        if (a->cipher_list_by_id != NULL)
                sk_SSL_CIPHER_free(a->cipher_list_by_id);
        if (a->cert != NULL)
                ssl_cert_free(a->cert);
        if (a->client_CA != NULL)
                sk_X509_NAME_pop_free(a->client_CA,X509_NAME_free);
        if (a->extra_certs != NULL)
                sk_X509_pop_free(a->extra_certs,X509_free);
#if 0 /* This should never be done, since it removes a global database */
        if (a->comp_methods != NULL)
                sk_SSL_COMP_pop_free(a->comp_methods,SSL_COMP_free);
#else
        a->comp_methods = NULL;
#endif
        OPENSSL_free(a);
        }

void SSL_CTX_set_default_passwd_cb(SSL_CTX *ctx, pem_password_cb *cb)
        {
        ctx->default_passwd_callback=cb;
        }

void SSL_CTX_set_default_passwd_cb_userdata(SSL_CTX *ctx,void *u)
        {
        ctx->default_passwd_callback_userdata=u;
        }

void SSL_CTX_set_cert_verify_callback(SSL_CTX *ctx,int (*cb)(),char *arg)
        {
        /* now
         *     int (*cb)(X509_STORE_CTX *),
         * but should be
         *     int (*cb)(X509_STORE_CTX *, void *arg)
         */
        ctx->app_verify_callback=cb;
        ctx->app_verify_arg=arg; /* never used */
        }

void SSL_CTX_set_verify(SSL_CTX *ctx,int mode,int (*cb)(int, X509_STORE_CTX *))
        {
        ctx->verify_mode=mode;
        ctx->default_verify_callback=cb;
        /* This needs cleaning up EAY EAY EAY */
        X509_STORE_set_verify_cb_func(ctx->cert_store,cb);
        }

void SSL_CTX_set_verify_depth(SSL_CTX *ctx,int depth)
        {
        ctx->verify_depth=depth;
        }

void ssl_set_cert_masks(CERT *c, SSL_CIPHER *cipher)
        {
        CERT_PKEY *cpk;
        int rsa_enc,rsa_tmp,rsa_sign,dh_tmp,dh_rsa,dh_dsa,dsa_sign;
        int rsa_enc_export,dh_rsa_export,dh_dsa_export;
        int rsa_tmp_export,dh_tmp_export,kl;
        unsigned long mask,emask;

        if (c == NULL) return;

        kl=SSL_C_EXPORT_PKEYLENGTH(cipher);

#ifndef NO_RSA
        rsa_tmp=(c->rsa_tmp != NULL || c->rsa_tmp_cb != NULL);
        rsa_tmp_export=(c->rsa_tmp_cb != NULL ||
                (rsa_tmp && RSA_size(c->rsa_tmp)*8 <= kl));
#else
        rsa_tmp=rsa_tmp_export=0;
#endif
#ifndef NO_DH
        dh_tmp=(c->dh_tmp != NULL || c->dh_tmp_cb != NULL);
        dh_tmp_export=(c->dh_tmp_cb != NULL ||
                (dh_tmp && DH_size(c->dh_tmp)*8 <= kl));
#else
        dh_tmp=dh_tmp_export=0;
#endif

        cpk= &(c->pkeys[SSL_PKEY_RSA_ENC]);
        rsa_enc= (cpk->x509 != NULL && cpk->privatekey != NULL);
        rsa_enc_export=(rsa_enc && EVP_PKEY_size(cpk->privatekey)*8 <= kl);
        cpk= &(c->pkeys[SSL_PKEY_RSA_SIGN]);
        rsa_sign=(cpk->x509 != NULL && cpk->privatekey != NULL);
        cpk= &(c->pkeys[SSL_PKEY_DSA_SIGN]);
        dsa_sign=(cpk->x509 != NULL && cpk->privatekey != NULL);
        cpk= &(c->pkeys[SSL_PKEY_DH_RSA]);
        dh_rsa=  (cpk->x509 != NULL && cpk->privatekey != NULL);
        dh_rsa_export=(dh_rsa && EVP_PKEY_size(cpk->privatekey)*8 <= kl);
        cpk= &(c->pkeys[SSL_PKEY_DH_DSA]);
/* FIX THIS EAY EAY EAY */
        dh_dsa=  (cpk->x509 != NULL && cpk->privatekey != NULL);
        dh_dsa_export=(dh_dsa && EVP_PKEY_size(cpk->privatekey)*8 <= kl);

        mask=0;
        emask=0;

#ifdef CIPHER_DEBUG
        printf("rt=%d rte=%d dht=%d re=%d ree=%d rs=%d ds=%d dhr=%d dhd=%d\n",
                rsa_tmp,rsa_tmp_export,dh_tmp,
                rsa_enc,rsa_enc_export,rsa_sign,dsa_sign,dh_rsa,dh_dsa);
#endif

        if (rsa_enc || (rsa_tmp && rsa_sign))
                mask|=SSL_kRSA;
        if (rsa_enc_export || (rsa_tmp_export && (rsa_sign || rsa_enc)))
                emask|=SSL_kRSA;

#if 0
        /* The match needs to be both kEDH and aRSA or aDSA, so don't worry */
        if (    (dh_tmp || dh_rsa || dh_dsa) && 
                (rsa_enc || rsa_sign || dsa_sign))
                mask|=SSL_kEDH;
        if ((dh_tmp_export || dh_rsa_export || dh_dsa_export) &&
                (rsa_enc || rsa_sign || dsa_sign))
                emask|=SSL_kEDH;
#endif

        if (dh_tmp_export) 
                emask|=SSL_kEDH;

        if (dh_tmp)
                mask|=SSL_kEDH;

        if (dh_rsa) mask|=SSL_kDHr;
        if (dh_rsa_export) emask|=SSL_kDHr;

        if (dh_dsa) mask|=SSL_kDHd;
        if (dh_dsa_export) emask|=SSL_kDHd;

        if (rsa_enc || rsa_sign)
                {
                mask|=SSL_aRSA;
                emask|=SSL_aRSA;
                }

        if (dsa_sign)
                {
                mask|=SSL_aDSS;
                emask|=SSL_aDSS;
                }

        mask|=SSL_aNULL;
        emask|=SSL_aNULL;

#ifndef NO_KRB5
        mask|=SSL_kKRB5|SSL_aKRB5;
        emask|=SSL_kKRB5|SSL_aKRB5;
#endif

        c->mask=mask;
        c->export_mask=emask;
        c->valid=1;
        }

/* THIS NEEDS CLEANING UP */
X509 *ssl_get_server_send_cert(SSL *s)
        {
        unsigned long alg,mask,kalg;
        CERT *c;
        int i,is_export;

        c=s->cert;
        ssl_set_cert_masks(c, s->s3->tmp.new_cipher);
        alg=s->s3->tmp.new_cipher->algorithms;
        is_export=SSL_C_IS_EXPORT(s->s3->tmp.new_cipher);
        mask=is_export?c->export_mask:c->mask;
        kalg=alg&(SSL_MKEY_MASK|SSL_AUTH_MASK);

        if      (kalg & SSL_kDHr)
                i=SSL_PKEY_DH_RSA;
        else if (kalg & SSL_kDHd)
                i=SSL_PKEY_DH_DSA;
        else if (kalg & SSL_aDSS)
                i=SSL_PKEY_DSA_SIGN;
        else if (kalg & SSL_aRSA)
                {
                if (c->pkeys[SSL_PKEY_RSA_ENC].x509 == NULL)
                        i=SSL_PKEY_RSA_SIGN;
                else
                        i=SSL_PKEY_RSA_ENC;
                }
        else if (kalg & SSL_aKRB5)
                {
                /* VRS something else here? */
                return(NULL);
                }
        else /* if (kalg & SSL_aNULL) */
                {
                SSLerr(SSL_F_SSL_GET_SERVER_SEND_CERT,SSL_R_INTERNAL_ERROR);
                return(NULL);
                }
        if (c->pkeys[i].x509 == NULL) return(NULL);
        return(c->pkeys[i].x509);
        }

EVP_PKEY *ssl_get_sign_pkey(SSL *s,SSL_CIPHER *cipher)
        {
        unsigned long alg;
        CERT *c;

        alg=cipher->algorithms;
        c=s->cert;

        if ((alg & SSL_aDSS) &&
                (c->pkeys[SSL_PKEY_DSA_SIGN].privatekey != NULL))
                return(c->pkeys[SSL_PKEY_DSA_SIGN].privatekey);
        else if (alg & SSL_aRSA)
                {
                if (c->pkeys[SSL_PKEY_RSA_SIGN].privatekey != NULL)
                        return(c->pkeys[SSL_PKEY_RSA_SIGN].privatekey);
                else if (c->pkeys[SSL_PKEY_RSA_ENC].privatekey != NULL)
                        return(c->pkeys[SSL_PKEY_RSA_ENC].privatekey);
                else
                        return(NULL);
                }
        else /* if (alg & SSL_aNULL) */
                {
                SSLerr(SSL_F_SSL_GET_SIGN_PKEY,SSL_R_INTERNAL_ERROR);
                return(NULL);
                }
        }

void ssl_update_cache(SSL *s,int mode)
        {
        int i;

        /* If the session_id_length is 0, we are not supposed to cache it,
         * and it would be rather hard to do anyway :-) */
        if (s->session->session_id_length == 0) return;

        if ((s->ctx->session_cache_mode & mode)
                && (!s->hit)
                && SSL_CTX_add_session(s->ctx,s->session)
                && (s->ctx->new_session_cb != NULL))
                {
                CRYPTO_add(&s->session->references,1,CRYPTO_LOCK_SSL_SESSION);
                if (!s->ctx->new_session_cb(s,s->session))
                        SSL_SESSION_free(s->session);
                }

        /* auto flush every 255 connections */
        i=s->ctx->session_cache_mode;
        if ((!(i & SSL_SESS_CACHE_NO_AUTO_CLEAR)) &&
                ((i & mode) == mode))
                {
                if (  (((mode & SSL_SESS_CACHE_CLIENT)
                        ?s->ctx->stats.sess_connect_good
                        :s->ctx->stats.sess_accept_good) & 0xff) == 0xff)
                        {
                        SSL_CTX_flush_sessions(s->ctx,time(NULL));
                        }
                }
        }

SSL_METHOD *SSL_get_ssl_method(SSL *s)
        {
        return(s->method);
        }

int SSL_set_ssl_method(SSL *s,SSL_METHOD *meth)
        {
        int conn= -1;
        int ret=1;

        if (s->method != meth)
                {
                if (s->handshake_func != NULL)
                        conn=(s->handshake_func == s->method->ssl_connect);

                if (s->method->version == meth->version)
                        s->method=meth;
                else
                        {
                        s->method->ssl_free(s);
                        s->method=meth;
                        ret=s->method->ssl_new(s);
                        }

                if (conn == 1)
                        s->handshake_func=meth->ssl_connect;
                else if (conn == 0)
                        s->handshake_func=meth->ssl_accept;
                }
        return(ret);
        }

int SSL_get_error(SSL *s,int i)
        {
        int reason;
        unsigned long l;
        BIO *bio;

        if (i > 0) return(SSL_ERROR_NONE);

        /* Make things return SSL_ERROR_SYSCALL when doing SSL_do_handshake
         * etc, where we do encode the error */
        if ((l=ERR_peek_error()) != 0)
                {
                if (ERR_GET_LIB(l) == ERR_LIB_SYS)
                        return(SSL_ERROR_SYSCALL);
                else
                        return(SSL_ERROR_SSL);
                }

        if ((i < 0) && SSL_want_read(s))
                {
                bio=SSL_get_rbio(s);
                if (BIO_should_read(bio))
                        return(SSL_ERROR_WANT_READ);
                else if (BIO_should_write(bio))
                        /* This one doesn't make too much sense ... We never try
                         * to write to the rbio, and an application program where
                         * rbio and wbio are separate couldn't even know what it
                         * should wait for.
                         * However if we ever set s->rwstate incorrectly
                         * (so that we have SSL_want_read(s) instead of
                         * SSL_want_write(s)) and rbio and wbio *are* the same,
                         * this test works around that bug; so it might be safer
                         * to keep it. */
                        return(SSL_ERROR_WANT_WRITE);
                else if (BIO_should_io_special(bio))
                        {
                        reason=BIO_get_retry_reason(bio);
                        if (reason == BIO_RR_CONNECT)
                                return(SSL_ERROR_WANT_CONNECT);
                        else if (reason == BIO_RR_ACCEPT)
                                return(SSL_ERROR_WANT_ACCEPT);
                        else
                                return(SSL_ERROR_SYSCALL); /* unknown */
                        }
                }

        if ((i < 0) && SSL_want_write(s))
                {
                bio=SSL_get_wbio(s);
                if (BIO_should_write(bio))
                        return(SSL_ERROR_WANT_WRITE);
                else if (BIO_should_read(bio))
                        /* See above (SSL_want_read(s) with BIO_should_write(bio)) */
                        return(SSL_ERROR_WANT_READ);
                else if (BIO_should_io_special(bio))
                        {
                        reason=BIO_get_retry_reason(bio);
                        if (reason == BIO_RR_CONNECT)
                                return(SSL_ERROR_WANT_CONNECT);
                        else if (reason == BIO_RR_ACCEPT)
                                return(SSL_ERROR_WANT_ACCEPT);
                        else
                                return(SSL_ERROR_SYSCALL);
                        }
                }
        if ((i < 0) && SSL_want_x509_lookup(s))
                {
                return(SSL_ERROR_WANT_X509_LOOKUP);
                }

        if (i == 0)
                {
                if (s->version == SSL2_VERSION)
                        {
                        /* assume it is the socket being closed */
                        return(SSL_ERROR_ZERO_RETURN);
                        }
                else
                        {
                        if ((s->shutdown & SSL_RECEIVED_SHUTDOWN) &&
                                (s->s3->warn_alert == SSL_AD_CLOSE_NOTIFY))
                                return(SSL_ERROR_ZERO_RETURN);
                        }
                }
        return(SSL_ERROR_SYSCALL);
        }

int SSL_do_handshake(SSL *s)
        {
        int ret=1;

        if (s->handshake_func == NULL)
                {
                SSLerr(SSL_F_SSL_DO_HANDSHAKE,SSL_R_CONNECTION_TYPE_NOT_SET);
                return(-1);
                }

        s->method->ssl_renegotiate_check(s);

        if (SSL_in_init(s) || SSL_in_before(s))
                {
                ret=s->handshake_func(s);
                }
        return(ret);
        }

/* For the next 2 functions, SSL_clear() sets shutdown and so
 * one of these calls will reset it */
void SSL_set_accept_state(SSL *s)
        {
        s->server=1;
        s->shutdown=0;
        s->state=SSL_ST_ACCEPT|SSL_ST_BEFORE;
        s->handshake_func=s->method->ssl_accept;
        /* clear the current cipher */
        ssl_clear_cipher_ctx(s);
        }

void SSL_set_connect_state(SSL *s)
        {
        s->server=0;
        s->shutdown=0;
        s->state=SSL_ST_CONNECT|SSL_ST_BEFORE;
        s->handshake_func=s->method->ssl_connect;
        /* clear the current cipher */
        ssl_clear_cipher_ctx(s);
        }

int ssl_undefined_function(SSL *s)
        {
        SSLerr(SSL_F_SSL_UNDEFINED_FUNCTION,ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
        return(0);
        }

SSL_METHOD *ssl_bad_method(int ver)
        {
        SSLerr(SSL_F_SSL_BAD_METHOD,ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
        return(NULL);
        }

const char *SSL_get_version(SSL *s)
        {
        if (s->version == TLS1_VERSION)
                return("TLSv1");
        else if (s->version == SSL3_VERSION)
                return("SSLv3");
        else if (s->version == SSL2_VERSION)
                return("SSLv2");
        else
                return("unknown");
        }

SSL *SSL_dup(SSL *s)
        {
        STACK_OF(X509_NAME) *sk;
        X509_NAME *xn;
        SSL *ret;
        int i;
                 
        if ((ret=SSL_new(SSL_get_SSL_CTX(s))) == NULL)
            return(NULL);
                          
        if (s->session != NULL)
                {
                /* This copies session-id, SSL_METHOD, sid_ctx, and 'cert' */
                SSL_copy_session_id(ret,s);
                }
        else
                {
                /* No session has been established yet, so we have to expect
                 * that s->cert or ret->cert will be changed later --
                 * they should not both point to the same object,
                 * and thus we can't use SSL_copy_session_id. */

                ret->method = s->method;
                ret->method->ssl_new(ret);

                if (s->cert != NULL)
                        {
                        ret->cert = ssl_cert_dup(s->cert);
                        if (ret->cert == NULL)
                                goto err;
                        }
                                
                SSL_set_session_id_context(ret,
                        s->sid_ctx, s->sid_ctx_length);
                }

        SSL_set_read_ahead(ret,SSL_get_read_ahead(s));
        SSL_set_verify(ret,SSL_get_verify_mode(s),
                SSL_get_verify_callback(s));
        SSL_set_verify_depth(ret,SSL_get_verify_depth(s));

        SSL_set_info_callback(ret,SSL_get_info_callback(s));
        
        ret->debug=s->debug;
        ret->options=s->options;

        /* copy app data, a little dangerous perhaps */
        if (!CRYPTO_dup_ex_data(ssl_meth,&ret->ex_data,&s->ex_data))
                goto err;

        /* setup rbio, and wbio */
        if (s->rbio != NULL)
                {
                if (!BIO_dup_state(s->rbio,(char *)&ret->rbio))
                        goto err;
                }
        if (s->wbio != NULL)
                {
                if (s->wbio != s->rbio)
                        {
                        if (!BIO_dup_state(s->wbio,(char *)&ret->wbio))
                                goto err;
                        }
                else
                        ret->wbio=ret->rbio;
                }

        /* dup the cipher_list and cipher_list_by_id stacks */
        if (s->cipher_list != NULL)
                {
                if ((ret->cipher_list=sk_SSL_CIPHER_dup(s->cipher_list)) == NULL)
                        goto err;
                }
        if (s->cipher_list_by_id != NULL)
                if ((ret->cipher_list_by_id=sk_SSL_CIPHER_dup(s->cipher_list_by_id))
                        == NULL)
                        goto err;

        /* Dup the client_CA list */
        if (s->client_CA != NULL)
                {
                if ((sk=sk_X509_NAME_dup(s->client_CA)) == NULL) goto err;
                ret->client_CA=sk;
                for (i=0; i<sk_X509_NAME_num(sk); i++)
                        {
                        xn=sk_X509_NAME_value(sk,i);
                        if (sk_X509_NAME_set(sk,i,X509_NAME_dup(xn)) == NULL)
                                {
                                X509_NAME_free(xn);
                                goto err;
                                }
                        }
                }

        ret->shutdown=s->shutdown;
        ret->state=s->state;
        ret->handshake_func=s->handshake_func;
        ret->server=s->server;

        if (0)
                {
err:
                if (ret != NULL) SSL_free(ret);
                ret=NULL;
                }
        return(ret);
        }

void ssl_clear_cipher_ctx(SSL *s)
        {
        if (s->enc_read_ctx != NULL)
                {
                EVP_CIPHER_CTX_cleanup(s->enc_read_ctx);
                OPENSSL_free(s->enc_read_ctx);
                s->enc_read_ctx=NULL;
                }
        if (s->enc_write_ctx != NULL)
                {
                EVP_CIPHER_CTX_cleanup(s->enc_write_ctx);
                OPENSSL_free(s->enc_write_ctx);
                s->enc_write_ctx=NULL;
                }
        if (s->expand != NULL)
                {
                COMP_CTX_free(s->expand);
                s->expand=NULL;
                }
        if (s->compress != NULL)
                {
                COMP_CTX_free(s->compress);
                s->compress=NULL;
                }
        }

/* Fix this function so that it takes an optional type parameter */
X509 *SSL_get_certificate(SSL *s)
        {
        if (s->cert != NULL)
                return(s->cert->key->x509);
        else
                return(NULL);
        }

/* Fix this function so that it takes an optional type parameter */
EVP_PKEY *SSL_get_privatekey(SSL *s)
        {
        if (s->cert != NULL)
                return(s->cert->key->privatekey);
        else
                return(NULL);
        }

SSL_CIPHER *SSL_get_current_cipher(SSL *s)
        {
        if ((s->session != NULL) && (s->session->cipher != NULL))
                return(s->session->cipher);
        return(NULL);
        }

int ssl_init_wbio_buffer(SSL *s,int push)
        {
        BIO *bbio;

        if (s->bbio == NULL)
                {
                bbio=BIO_new(BIO_f_buffer());
                if (bbio == NULL) return(0);
                s->bbio=bbio;
                }
        else
                {
                bbio=s->bbio;
                if (s->bbio == s->wbio)
                        s->wbio=BIO_pop(s->wbio);
                }
        (void)BIO_reset(bbio);
/*      if (!BIO_set_write_buffer_size(bbio,16*1024)) */
        if (!BIO_set_read_buffer_size(bbio,1))
                {
                SSLerr(SSL_F_SSL_INIT_WBIO_BUFFER,ERR_R_BUF_LIB);
                return(0);
                }
        if (push)
                {
                if (s->wbio != bbio)
                        s->wbio=BIO_push(bbio,s->wbio);
                }
        else
                {
                if (s->wbio == bbio)
                        s->wbio=BIO_pop(bbio);
                }
        return(1);
        }

void ssl_free_wbio_buffer(SSL *s)
        {
        if (s->bbio == NULL) return;

        if (s->bbio == s->wbio)
                {
                /* remove buffering */
                s->wbio=BIO_pop(s->wbio);
#ifdef REF_CHECK /* not the usual REF_CHECK, but this avoids adding one more preprocessor symbol */
                assert(s->wbio != NULL);
#endif  
        }
        BIO_free(s->bbio);
        s->bbio=NULL;
        }
        
void SSL_CTX_set_quiet_shutdown(SSL_CTX *ctx,int mode)
        {
        ctx->quiet_shutdown=mode;
        }

int SSL_CTX_get_quiet_shutdown(SSL_CTX *ctx)
        {
        return(ctx->quiet_shutdown);
        }

void SSL_set_quiet_shutdown(SSL *s,int mode)
        {
        s->quiet_shutdown=mode;
        }

int SSL_get_quiet_shutdown(SSL *s)
        {
        return(s->quiet_shutdown);
        }

void SSL_set_shutdown(SSL *s,int mode)
        {
        s->shutdown=mode;
        }

int SSL_get_shutdown(SSL *s)
        {
        return(s->shutdown);
        }

int SSL_version(SSL *s)
        {
        return(s->version);
        }

SSL_CTX *SSL_get_SSL_CTX(SSL *ssl)
        {
        return(ssl->ctx);
        }

#ifndef NO_STDIO
int SSL_CTX_set_default_verify_paths(SSL_CTX *ctx)
        {
        return(X509_STORE_set_default_paths(ctx->cert_store));
        }

int SSL_CTX_load_verify_locations(SSL_CTX *ctx, const char *CAfile,
                const char *CApath)
        {
        return(X509_STORE_load_locations(ctx->cert_store,CAfile,CApath));
        }
#endif

void SSL_set_info_callback(SSL *ssl,void (*cb)())
        {
        ssl->info_callback=cb;
        }

void (*SSL_get_info_callback(SSL *ssl))(void)
        {
        return((void (*)())ssl->info_callback);
        }

int SSL_state(SSL *ssl)
        {
        return(ssl->state);
        }

void SSL_set_verify_result(SSL *ssl,long arg)
        {
        ssl->verify_result=arg;
        }

long SSL_get_verify_result(SSL *ssl)
        {
        return(ssl->verify_result);
        }

int SSL_get_ex_new_index(long argl,void *argp,CRYPTO_EX_new *new_func,
                         CRYPTO_EX_dup *dup_func,CRYPTO_EX_free *free_func)
        {
        ssl_meth_num++;
        return(CRYPTO_get_ex_new_index(ssl_meth_num-1,
                &ssl_meth,argl,argp,new_func,dup_func,free_func));
        }

int SSL_set_ex_data(SSL *s,int idx,void *arg)
        {
        return(CRYPTO_set_ex_data(&s->ex_data,idx,arg));
        }

void *SSL_get_ex_data(SSL *s,int idx)
        {
        return(CRYPTO_get_ex_data(&s->ex_data,idx));
        }

int SSL_CTX_get_ex_new_index(long argl,void *argp,CRYPTO_EX_new *new_func,
                             CRYPTO_EX_dup *dup_func,CRYPTO_EX_free *free_func)
        {
        ssl_ctx_meth_num++;
        return(CRYPTO_get_ex_new_index(ssl_ctx_meth_num-1,
                &ssl_ctx_meth,argl,argp,new_func,dup_func,free_func));
        }

int SSL_CTX_set_ex_data(SSL_CTX *s,int idx,void *arg)
        {
        return(CRYPTO_set_ex_data(&s->ex_data,idx,arg));
        }

void *SSL_CTX_get_ex_data(SSL_CTX *s,int idx)
        {
        return(CRYPTO_get_ex_data(&s->ex_data,idx));
        }

int ssl_ok(SSL *s)
        {
        return(1);
        }

X509_STORE *SSL_CTX_get_cert_store(SSL_CTX *ctx)
        {
        return(ctx->cert_store);
        }

void SSL_CTX_set_cert_store(SSL_CTX *ctx,X509_STORE *store)
        {
        if (ctx->cert_store != NULL)
                X509_STORE_free(ctx->cert_store);
        ctx->cert_store=store;
        }

int SSL_want(SSL *s)
        {
        return(s->rwstate);
        }

/*!
 * \brief Set the callback for generating temporary RSA keys.
 * \param ctx the SSL context.
 * \param cb the callback
 */

#ifndef NO_RSA
void SSL_CTX_set_tmp_rsa_callback(SSL_CTX *ctx,RSA *(*cb)(SSL *ssl,
                                                          int is_export,
                                                          int keylength))
    {
    SSL_CTX_callback_ctrl(ctx,SSL_CTRL_SET_TMP_RSA_CB,(void (*)())cb);
    }

void SSL_set_tmp_rsa_callback(SSL *ssl,RSA *(*cb)(SSL *ssl,
                                                  int is_export,
                                                  int keylength))
    {
    SSL_callback_ctrl(ssl,SSL_CTRL_SET_TMP_RSA_CB,(void (*)())cb);
    }
#endif

#ifdef DOXYGEN
/*!
 * \brief The RSA temporary key callback function.
 * \param ssl the SSL session.
 * \param is_export \c TRUE if the temp RSA key is for an export ciphersuite.
 * \param keylength if \c is_export is \c TRUE, then \c keylength is the size
 * of the required key in bits.
 * \return the temporary RSA key.
 * \sa SSL_CTX_set_tmp_rsa_callback, SSL_set_tmp_rsa_callback
 */

RSA *cb(SSL *ssl,int is_export,int keylength)
    {}
#endif

/*!
 * \brief Set the callback for generating temporary DH keys.
 * \param ctx the SSL context.
 * \param dh the callback
 */

#ifndef NO_DH
void SSL_CTX_set_tmp_dh_callback(SSL_CTX *ctx,DH *(*dh)(SSL *ssl,int is_export,
                                                        int keylength))
    {
    SSL_CTX_callback_ctrl(ctx,SSL_CTRL_SET_TMP_DH_CB,(void (*)())dh);
    }

void SSL_set_tmp_dh_callback(SSL *ssl,DH *(*dh)(SSL *ssl,int is_export,
                                                int keylength))
    {
    SSL_callback_ctrl(ssl,SSL_CTRL_SET_TMP_DH_CB,(void (*)())dh);
    }
#endif

#if defined(_WINDLL) && defined(WIN16)
#include "../crypto/bio/bss_file.c"
#endif

IMPLEMENT_STACK_OF(SSL_CIPHER)
IMPLEMENT_STACK_OF(SSL_COMP)